i have seen an old classic bike with inverted forks i think it was a Francis Barnet and i would say it was at least 60 years old and it was taken from a shed where it had been lying untouched for over 20 years.
i am no expert on classic bike so i cannot give any more info than that but it definently had inverted forks . I think the bmw mentioned previous had normal forks with a sleeve over to protect them and makes it look like it might be inverted forks

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